package main

import (
    "net/smtp"
    "fmt"
    "strings"
)

/*
 *  user : example@example.com login smtp server user
 *  password: xxxxx login smtp server password
 *  host: smtp.example.com:port   smtp.163.com:25
 *  to: example@example.com;example1@163.com;example2@sina.com.cn;...
 *  subject:The subject of mail
 *  body: The content of mail
 *  mailtyoe: mail type html or text
 */

func SendMail(user, password, host, to, subject, body, mailtype string) error{
    hp := strings.Split(host, ":")
    auth := smtp.PlainAuth("", user, password, hp[0])
    var content_type string
    if mailtype == "html" {
        content_type = "Content-Type: text/"+ mailtype + "; charset=UTF-8"
    }else{
        content_type = "Content-Type: text/plain" + "; charset=UTF-8"
    }

    msg := []byte("To: " + to + "\r\nFrom: " + user + "<"+ user +">\r\nSubject: " + subject + "\r\n" + content_type + "\r\n\r\n" + body)
    send_to := strings.Split(to, ";")
    err := smtp.SendMail(host, auth, user, send_to, msg)
    return err
}

func main() {
    user := "lingjip@gmail.com"
    password := "1181151539"
    host := "smtp.gmail.com:25"
    to := "lingjip@gmail.com;gouihk@126.com"

    subject := "Test send email by golang"

    body := `
    <html>
    <body>
    <a href="http://www.baidu.com">Baidu</a>
    <br/>
    <img src="http://www.google.com.hk/images/srpr/logo4w.png">img</img>
    <h3>Test send email by golang</h3>
    </body>
    </html>
    `
    fmt.Println("send email")
    err := SendMail(user, password, host, to, subject, body, "html")
    if err != nil {
        fmt.Println("send mail error!")
        fmt.Println(err)
    }else{
        fmt.Println("send mail success!")
    }

}
